Propeller.



J. F. NETTLVE.

PROPELLER.

APPLIOATION FILED JULY 5, 1911.

1 22,203. Y Patented Apr. 2, 1912.

luvs/non J55]: 76574 A TTORNEYS UNITE STATES PATENT OFFICE.

JOHN F. NETTLE, OF BUTTE, MONTANA.

PROPELLER.

To all. whom it may concern:

Be it known that I, JOHN F. Nn'nrnn, a citizen of the United States, anda resident of Butte, in the county of Silverbow and State of Montana,have invented a new and Improved Propeller, of which the following is afull, clear, and exact description.

My invention relates to propellers and it has for its object to providea propeller having a blade on the driving face of which there is secureda projecting member to prevent the water from slipping on the said faceof the blade.

Additional objects of the invention will appear in the followingspecification, in which the preferred form of my invention is described.

Similar reference characters'refer to similar parts in all the views, inwhich- Figure 1 is an end view of the propeller; Fig. 2 is alongitudinal sectional view of one of the propeller blades; Fig. 3 is anend view of a propellerblade showing a modified form of the invention;Fig. 4 is an end view of a propeller blade showing another form of theinvention; Fig. 5 is an end view of an aerial propeller provided with myimproved ribs; Fig. 6 is a perspective view of one of the ribs; Fig. 7is an end view of an aerial propeller blade provided with the modifiedform of the invention shown in Fig. 4 of the drawings; and Fig. 8 is aperspective view showing the rib used with the modified form of theinvention shown in Fig. 3 of the drawings.

By referring to the drawings it will be seen that propeller blades 5 areprovided with transverse projecting members or ribs 6, these ribsextending from the driving faces of the propeller blades and beingtapered in the direction of the free terminals 7 of the propellerblades, the projecting members or ribs being also tapered at their ends8.

In the modified form of the invention shown in Fig. 3 of the drawings,the projecting members or ribs 9 are curved across the propeller blade10. These curved projecting members or ribs 9 are tapered in theSpecification of Letters Patent.

Application filed July 5, 1911.

Patented Apr. 2, 1912.

Serial No. 636,835.

direction of the free terminals 11 of the blades, and they also taper attheir ends 12 in the manner indicated with reference to the form of theinvention shown in Fig. 1 of the drawings.

In the modified form of the invention shown in Fig. 4 of the drawings,there are two series of projecting members or ribs 13, which aredisposed side by side on the driving face of the propeller blade 14.,projecting members or ribs 13 in one of the series being disposedbetween the longitudinal.

planes of the projecting members in the other series. In this form ofthe invention I prefer to make use of a projecting member or rib 15which extends completely across the propeller blade 14; in closeproximity to the free terminal of the said propeller blade.

The form of the invention shown in Fig. 5 corresponds substantially withthe form of the invention shown in Fig. 1, the only (lifferenee beingthat the ribs are mounted on an aerial propeller instead of on a marinepropeller, such as shown in Fig. 1 of the drawings.

The arrangement of the projecting men1- bers or ribs on the form of theinvention shown in Fig. 7 of the drawings corresponds with thearrangement of the projecting members or ribs shown in Fig. 4- of thedrawings, but in Fig. 7 of the drawings, I show the invention as appliedto aerial propeller, while in Fig. 4 of the drawings, I show theinvention as applied to marine propeller.

It will be understood that the projecting members or ribs will preventthe water or air from slipping over the driving surfaces of the blades,thereby adding to the efliciency of the blades, without anycorresponding increase in driving power.

I prefer to have the projecting members or ribs tapering in thedirection of the free ends of the blades so as to prevent the formationof eddies. The projecting members or ribs are also tapered at theirterminals so that they will offer the least possible resistance.

Having thus described my invention, I

claim as new and desire to secure by Letters In testimony whereof I havesigned my Patent: name to this specification in the presence of 10 In apropeller, a blade having a face, and tWo subscribing Witnesses. tWoseries of projecting members disposed JOHN F NETTLE side by side andtransversely of the blade,

the projecting member in one series being WVitnesses:

disposed between the longitudinal planes of WILLIAM J. KITTO, V theprojecting members in the other series. GEORGE I-Ioornn.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. C.

